ETA 651

 
ETA 651

ETA 651

Description

From the 1930s dates this extremly shaped ladies’ watch movement, which is only 10.2mm (4 1/4 lignes) small, but 22.8mm (10 lignes) long.

Hard do believe, but watches in this extreme shape were very popular that time.

base plate

base plate

With the 15 jewels, the ETA 651 has got, all important bearings contain rubies.

It’s noteable, that the mainspring barrel has got a pretty large diameter, but there’s still unused space, which would have allowed an even larger barrel.

gear train

gear train

We have the classical gear train here, with directly driven center minute wheel, followed by the rather small third and fourth wheel and finally the steel escape wheel.

side view of the gear train

side view of the gear train

The non shock protected screw balance is made of two different metal layers, but its not slittet like a normal bimetal balance.

It beats with 18000 A/h, controls a swiss pallet lever escapement and can be adjustet with a long regulator arm.

ETA 651: Dial side

ETA 651: Dial side

The ETA uses of yoke winding system, of course.

If you look closely, you can see the old ETA hallmark. It was only used until the late 1930s, before it was replaced by the Ebauches Shield with ETA letters inside.

Technical data

Manufacturer:ETA
Caliber:651
Size:4 1/4 x 10''' (measured: 10,2 x 22,8mm)
A/h:18000
Number of jewels:15
Escapement:Pallet lever
Balance types: bimetallic screw balance (two legs)
Shock protection(s): none
Balance bearing / direction hairspring:Counterclockwise
Moveable stud:no
Adjust mechanism:Long regulator arm
Construction:
  • lever
  • escape wheel
  • seconds wheel, third wheel, center minute wheel
  • mainspring barrel
Construction type:solid construction
Winding mechanism:yoke winding system
Setting lever spring:3 hole(s)
References: Ebauches: 1948 4
Flume: 1944 76
Jacob: 1942 26
Inventory number:20056

Usage gallery

Para ladies' watch  (without case and hands)

Para ladies' watch (without case and hands)

This movement is a kind donation from Klaus Brunnemer to the movement archive. Thank you very much for your great support!